/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: lucky
 * Date: 2022-08-04
 * Time: 11:15
 */
class Anninal{
    public void eat(){
    }
}
class Duck{
    public void run(){
    }
}
public class Demo2 {
    public static void Use(Object obj) {
        System.out.println(obj);
    }
    public static void main(String[] args) {
        Use(new Anninal());
        Use(new Duck());
    }
}
